COLUMBUS, Ohio -- The cost of gas for Ohio drivers is up slightly compared with last week.

The state's average for a gallon of regular gas was $3.48 Monday, according to the survey from auto club AAA, the Oil Price Information Service and Wright Express. That's up 6 cents from a week ago.

Compared with the average at this time last year, it's 28 cents cheaper.

The average nationwide was $3.54 per gallon on Monday. That's down a penny from a week ago and is 18 cents less than a year ago.

Analysts are keeping an eye on oil production and export disruptions caused by turmoil in the Middle East and North Africa. There's also concern that violence could spread and block important supply routes.